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参数资料
| 型号： | TPS2590RSA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 4 X 4 MM, PLASTIC, QFN-16 |
| 文件页数： | 4/18页 |
| 文件大小： | 1021K |
| 代理商： | TPS2590RSA |
2
IN
MIN
V
R
12
=
(
)
NOM
LOAD
SPIKE absolute
L
V
I
C
=
+
( )
straightwire
4 L
L
0.2 L ln
0.75
nH
D
-
÷
è
SLUS960B – JULY 2009 – REVISED AUGUST 2010
www.ti.com
APPLICATION INFORMATION
Maximum Load at Startup
The power limiting function of the TPS2590 provides very effective protection for the internal FET. Expectedly,
there is a supply voltage dependent maximum load which the device will be able to power up. Loads above this
level may cause the device to shut off current before startup is complete. Neglecting any load capacitance, the
maximum load ( minimum load resistance ) is calculated using the equation;
(6)
Adding load capacitance may reduce the maximum load which can be present at start up.
If EN is tied to GND at startup and IN does not ramp quickly the TPS2590 may momentarily turn off then on
during startup. This can happen if a capacitive load momentarily pulls down the input voltage below the UV
threshold. If necessary, this can be avoided by delaying EN assertion until VIN is fully up.
Transient Protection
The need for transient protection in conjunction with hot-swap controllers should always be considered. When
the TPS2590 interrupts current flow, input inductance generates a positive voltage spike on the input and output
inductance generates a negative voltage spike on the output. Such transients can easily exceed twice the supply
voltage if steps are not taken to address the issue. Typical methods for addressing transients include;
Minimizing lead length/inductance into and out of the device.
Transient Voltage Suppressors (TVS) on the input to absorb inductive spikes.
Shottky diode across the output to absorb negative spikes.
A combination of ceramic and electrolytic capacitors on the input and output to absorb energy.
The following equation estimates the magnitude of these voltage spikes:
Where;
(7)
VNOM equals the nominal supply voltage.
ILOAD equals the load current.
C equals the capacitance present at the input or output of the TPS2590.
L equals the effective inductance seen looking into the source or the load.
The inductance due to a straight length of wire equals approximately.
Where;
(8)
L equals the length of the wire.
D equals wire diameter.
Some applications may require the addition of a TVS to prevent transients from exceeding the absolute ratings if
sufficient capacitance cannot be included.
12
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2590
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